Thanks for your bugreport. This was indeed a pretty bad error message :/
We fixed this a while ago and here is the error message from current snapd in
xenial-updates:
"""
$ sudo snap login [email protected]
Password of "[email protected]":
error: cannot authenticate to snap store: Provided email/password is not
correct. (see "snap login --help")
"""
** Changed in: snapd (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1579555
Title:
snap login failures give poor error messages
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